oblicz sume liczb 4cyfrowych parzystych ciągu arytmetycznego
a₁=1000
a₂=1002
r=a₂-a₁=2
an=9998
an=a₁+(n-1)r
9998=1000+(n-1)2
9998=1000+2n-2
2n=9998-1000+2
n=9000:2=4500
S₄₅₀₀=½(a₁+a₄₅₀₀)×4500=½(1000+9998)×4500=24 745 500
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a₁=1000
a₂=1002
r=a₂-a₁=2
an=9998
an=a₁+(n-1)r
9998=1000+(n-1)2
9998=1000+2n-2
2n=9998-1000+2
n=9000:2=4500
S₄₅₀₀=½(a₁+a₄₅₀₀)×4500=½(1000+9998)×4500=24 745 500